Carnival Miracle TV had inputs
I am not sure if all rooms had the same tv, but April 06 Carnival Miracle TV in Cat 11 had tv input jacks. We were able to have my son play those battery powered $20 atari games with RCA cables attached.
I also agree with portable DVD player idea. Where the TV's are placed, it is unlikely a young baby could see the TV well.
Adventure of the Seas RC April 2008
Carnival Liberty April 2007
Carnival Miracle April 2005
Carnival Destiny June 2001, July 2005
NCL Southward June 1985 Honeymoon!